Steam rock-drill



(No Model.)

2 Sheets-Sheet 1. G. W.v JONES. STEAM ROGK'DRILL.

Patented Nov. 29, 1887.

INVENTUR al A W.

(No Model.) 2 Sheets-Sheet 2.

G. W. JONES.

STEAM ROCK DRILL.

No. 373,894. Patented Nov. 29, 1887.

I; V Z

\A/ITNE5SE5 lmvamuq the bolt G and lever H, attached tothe eccen- UNITED STATES PATENT Erica.

GEORGE W. JoNEs, OF CLEVELAND, OHIO.

STEAM ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 373,894, dated November 29, 1887.

Application filed May 2, 1887. 1ScrialNo. 236,8G9. (N0 model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE W. JONES, of Cleveland, in the county of Ouyahoga and State ofOhio, have invented a certain new and Improved Steam Rock-Drill; and I do hereby declare that the following is a full, clear, and complete description thereof.

Myinvention relates to that class of rockdrills which are operated by steam-power; and" the improvement consists in. the peculiar construction and arrangement of the operative parts used in connection therewith.

That the invention may be more fully understood, reference will be had to the annexed specification and the accompanying drawings, in which-- p b Figure 1 represents a vertical section through the steam'cylinderand chest. Fig. 2 is ahori' zontal section of the same in line x 00. 'Fig. '3 is a face view of the'upper cylinder-head, showing the parts located therein. Fig. 4 is a vertical section of the said head in line 3 y, Fig. 3. Fig. 5 is a plan view of the head. Fig. 6 illustrates a plan view of the cylinder with the upper head removed. Fig. 7 is aside elevation of Fig. 1

Like letters of reference refer to like parts in the several views.

In the drawings, A represents the steamcylinder provided with the chest B and the heads 0 D, which may be either bolted or otherwise secured in place. Inside the said cylinder is placed the reciprocating piston E, with a conical extension, E, which is for the purpose of actuating the valve F, by means of trio-spindle I.

The steam-ports a and b and exhaust-port c are formed in an entirety with the cylinder A, and are in open relation with the steam-chest face (Z or valve'seat, respectively. The ports a b are under control of the slide-valve F, and lead alternately live steam from the steamchest into the cylinder and exhaust steani from the latter into the exhaust-port o. The pipes K and K alternately lead live steam to and exhaust-steam from the cylinder A.

Located within and extending transversely across the steam-chest Bis the spindle 1, above referred to. The same is held and guided in relation with the chest by means of the. pivot e and the stuffing-box L, which has a screwthreaded connection with the steam-chest B. This spindle I extends through the stufiing; box, and is provided with a hand-wheel, M, the purpose of'which will be hereinafter explained. The lever H is fitted to the central and eccentric part, 1, of said spindle I, one arm of which lever engages in the groovefof the valve F, and the other in a slot formed in the head ofthe bplt G, as seen in Fig. 1. The spring N. arranged within the cover 9, causes the bolt G to be at all times in contact with the piston-extension E aftersteam is shut off.

When steampressure is within the chest, the steam would then alone sufilce to hold the bolt G- in contact with the piston-extension E and vibrate the lever H for the operation of the valve F, so that steam may alternately be admitted to the upper or lower side of the piston in the cylinder for the reciprocating mo tion of the piston and its attachments.

The necessary rotation of the drill secured to the outer end of the piston-rod IE (not shown in the drawings) is obtained by the combination and arrangement of the following elements, which are located within the top head, 0, as seen in Figs. 1, 3, and 4. Said head 0 and the bottom head, D, are secured to the cylinder A by the bolts 0 and P. Interposed between the upper face of the eylinderA and that of the head 0 is the plate Q, on and by which the ratchet-wheel R is suspended, as seen in Fig. 1. The Stern R of said wheel is squareoand fits into a socket, R, inserted in the piston E. By this means the'piston E, while reciprocating within the cylinder A, is

.connected with the ratchet-wheel at every point'of its stroke. The stem R admits of the reciprocation of the piston, andimparts to the samethe rotation of the ratchet-wheel R. The feed attachment of said wheel'R is arranged to operate automatically, and for that purpose steam-power is utilized to actuate the pawl S for the rotation of the wheel R. Said pawl S- is pivotally attached to the piston T, Figs. 3 and 4, and moves with the latter within the small cylinder 0, projecting in a horizontal position from out the head 0. The open end of the small cylinder 0 is provided with a removable cap or plug, U, which admits of. the insertion or removal of the pistonT from that side. The opposite side of said cylinder 0 is in open relation with the interior of the head- G, and also with that of the cylinder A, by means of the openings h in the plate Q. Thus when through the port a steam is admitted into the cylinder A above the piston it causes the downward or outward stroke of the same. The steampressure will then,also,be active within the head 0 and force the piston '1 toward the rear of the cylinder 0. The piston T while moving backward withdraws the pawl S. for engagement into the next tooth of the ratchet-wheel R. The spring 5, located within the piston T and seated on the pawlS, forces the same toward the wheel and assures engagement with the next or following tooth. To prevent the piston T from being thrown with undue force againstthe cap U, the former is provided with a cylindrical projection, t, fitting into the recess V of the cap U, as seen in Fig. 4. By this means the steam which is active within the recess V has the tendency to retard the stroke of the piston Tand act as a cushioning device for the latter.

As illustrated in the drawings, steam is admitted through port a. and the piston is on its outstroke until the valve F travels beyond the port (1. Steam is then supplied through port I) to the under side of the piston for the return-stroke. As soon as the steam entersinto the cylinder by the way of the port I), the port i, communicating with the interior of the cylinder below the piston, will also be filled with Steam and carry the same to the top of cylinder A, into the horizontal port j, and from thence through the opening j into the cylinder G,betwcen the piston T and the cap U, which results in a forward movement of said piston and pawl and a consequent turning of the wheel R, which, by means of its square stem R, turns the piston and rod E with the drill attached thereto.

The eccentric part I of the spindle I, Figs. 1 and 3, is for the purpose of setting the valve F in relation to the ports a b. By means of the hand-wheel M the spindle I can be turned to either side, thereby throwing the eccentric 5 the downstroke of the piston without departing from the essential features of my invention.

The above-described steam rock-drill is mounted and operated upon a truck or frame of the usual style and construction, and by means of the lug A, Figs. 1 and 6, connection may be had with a feed-screw commonly employed with this class of drills.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In combination with the valve gearing of a Steam rook-drill. the slide-valve F, hell-crank lever H, pin G, spring N, and the conical extension E, all arranged within the steam-chest and cylinder, substantially as set forth.

2. In combination with the slide-valve of a steam rock-drill, a bellcrank lever fitted to an eccentricspindle. with bearings within the steam-chest, and a hand-wheel outside thereof to turn the spindle for the lateral adjustment of the vaive in relation to the steam-ports. for the purpose described, and substantially as shown.

3. The combination of the cylinder A, head 0, plate Q, interposed between said cylinder andhead andprovided with openings to receive the stem R of the ratchet-wheel R and allow the passage of steam from the cylinder into the head, piston E, pawl S, with piston T, spring s, and the ports z'j, all substantially as shown, and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE W. JONES.

\Vitnesses:

W. H. BURRIDGE, B. F. EIBLER. 

